“…In most cases, it is possible to reconstruct invariant sets of a fractal nature in the phase space related to chaotic advection (see, e.g., Péntek et al, 1995;Cartwright et al, 1999;Tél et al, 2000;Speetjens et al, 2021). Recent important applications are connected to the exploration of Lagrangian coherent structures (Haller, 2015;Hadjighasem et al, 2017;Haller et al, 2018;Beron-Vera et al, 2018;Callies, 2021;Haller et al, 2021), mostly in the context of ocean flows.…”